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User guide for the FIPS Red Hat Enterprise Linux - OpenSSL Module
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=================================================================
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This package contains libraries which comprise the FIPS 140-2
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Red Hat Enterprise Linux - OPENSSL Module.
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The module files
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================
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/usr/lib[64]/libcrypto.so.1.1.0
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/usr/lib[64]/libssl.so.1.1.0
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/usr/lib[64]/.libcrypto.so.1.1.0.hmac
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/usr/lib[64]/.libssl.so.1.1.0.hmac
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Dependencies
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============
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The approved mode of operation requires kernel with /dev/urandom RNG running
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with properties as defined in the security policy of the module. This is
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provided by kernel packages with validated Red Hat Enterprise Linux Kernel
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Crytographic Module.
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Installation
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============
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The RPM package of the module can be installed by standard tools recommended
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for installation of RPM packages on the Red Hat Enterprise Linux system (yum,
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rpm, RHN remote management tool).
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The RPM package dracut-fips must be installed for the approved mode of
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operation.
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Usage and API
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=============
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The module respects kernel command line FIPS setting. If the kernel command
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line contains option fips=1 the module will initialize in the FIPS approved
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mode of operation automatically. To allow for the automatic initialization the
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application using the module has to call one of the following API calls:
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- void OPENSSL_init_library(void) - this will do only a basic initialization
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of the library and does initialization of the FIPS approved mode without setting
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up EVP API with supported algorithms.
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- void OPENSSL_add_all_algorithms(void) - this API function calls
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OPENSSL_init() implicitly and also adds all approved algorithms to the EVP API
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in the approved mode
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- void SSL_library_init(void) - it calls OPENSSL_init() implicitly and also
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adds algorithms which are necessary for TLS protocol support and initializes
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the SSL library.
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To explicitely put the library to the approved mode the application can call
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the following function:
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- int FIPS_mode_set(int on) - if called with 1 as a parameter it will switch
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the library from the non-approved to the approved mode. If any of the selftests
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and integrity verification tests fail, the library is put into the error state
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and 0 is returned. If they succeed the return value is 1.
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To query the module whether it is in the approved mode or not:
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- int FIPS_mode(void) - returns 1 if the module is in the approved mode,
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0 otherwise.
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To query whether the module is in the error state:
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- int FIPS_selftest_failed(void) - returns 1 if the module is in the error
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state, 0 otherwise.
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To zeroize the FIPS RNG key and internal state the application calls:
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- void RAND_cleanup(void)
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